package com.example.demokafka;

import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.kafka.support.Acknowledgment;
import org.springframework.kafka.support.KafkaHeaders;
import org.springframework.messaging.handler.annotation.Header;
import org.springframework.stereotype.Component;

import java.util.Optional;

@Component
public class KafkaConsumer {

    @KafkaListener(topics = KafkaProducer.TOPIC_TEST, groupId = KafkaProducer.TOPIC_GROUP1)
    public void topic_test(ConsumerRecord<?, ?> record,
                           Acknowledgment ack,
                           @Header(KafkaHeaders.RECEIVED_TOPIC) String topic) {
        Optional message = Optional.ofNullable(record.value());
        if (message.isPresent()) {
            Object msg = message.get();
            System.err.println("topic_test 消费了： Topic:" + topic + ",Message:" + msg.toString());
            ack.acknowledge();
        }
    }


}
